Bushing-puller.



No. 867.181! PATENTED SEPT. 24, 1907. J. ZIMMS.

BUSHINGPULLER. APPLICATION FILED JUNE 25. 1907.

UNITED STATES PATENT ornron.

BUSHING-FULLER.

Specification of Letters Patent.

Patented Sept. 24;, 1907.

Application filed Tune 25, 1907. $erial No. 330,748.

To all whom it may concern:

Be it known that I, JosnPI-i ZIMMs, a citizen of the United States, and a resident of Blissville, Long Island City, county of Queens, State of New York, have invented certain new and useful Improvements in Bushing-Pullers, of which the following is a speci-' fication.

This invention relates to bushing pullers and is intended to provide an improved device for extracting bushings and is more especially adapted for the withdrawing of bushings from the chucks of rock drill pistons.

Owing to the pressure exerted in forcing a new bushing into a piston and the constant pounding which the bushing receives during the operation of the rock drill,

the bushing, when worn, is so tightly forced into the piston that it can only be extracted with great difficulty. The object of the invention is to provide an improved device by means of which the bushings may be extracted in a quick and reliable manner, and without injury to the pistons.

For this purpose my invention consists of a bushing puller, comprising a central rod, having a recess near one end and a slot near the other, a key for the recess projecting beyond the face of the rod, a sleeve, and a wedge interposed between one end of the slot of the rod and the sleeve.

The invention consists of certain further novel features and combination of parts which will be more fully described hereinafter and finally pointed out in the claims.

In the accompanying drawings Figure 1 represents an elevation of my improved bushing puller intended more particularly to show. the different sized recesses of the sleeve, Fig. 2 represents a longitudinal section, showing the bushing puller as inserted into a piston, ready to be operated for the withdrawal of the bushing, Fig. 3 showsa vertical transverse section, taken on line 33 of Fig. 2, Fig. 4 represents an end view of the sleeve, and Fig. 5 shows a perspective view of the key.

Similar letters of reference indicate corresponding parts.

Referring to the drawings A represents a central rod, having one portion thereof of smaller diameter than the other, whereby at the juncture of the two portions a shoulder a is formed. The portion of smaller diameter, a is provided with a recess B, located approximately below the usual opening O of the bushing 0, when the rod A is inserted therein. The portion of the rod of larger diameter, 0 is provided with a slot M, having one side thereof inclined to the axis of the rod, and the side opposite perpendicular thereto. This slot is adapted to be engaged by a wedge N. A sleeve 0 concentric to the rod is provided with a plurality of recesses of different sizes, a small size, 0 an intermediate size, 0 and a large size, 0 The number and size of the recesses may be changed as required.

A key G having a plane bottom, one end curved, with a shoulder portion 9 at that end, and the other end in clined as respects the bottom, is adapted to be inserted into the recess B, so that the inclined end of the key engages the inclined end of the recess. As is usual, the opening of the bushing is located below the opening D of the chuck E of the piston rod E The operation of improved puller is as follows: After the drill has been removed from the chuck of the piston, which still retains the jammed-in bushing, the end a of the rod A is inserted into the bushing C, until the shoulder of the rod abuts against the end of the bushing O. The recessed end of the rod, a, is inserted into the bushing, so as to have its recess-B directly below the opening C of the bushing C and the opening D of the chuck E. The sleeve 0 is then moved along the larger end of the rod A until it abuts against the end of the chuck E of the piston rod, after which the wedge N is inserted into the slot M of the rod A, and the sleeve so turned as to have its largest recess, 0 engaged by the wedge. The wedge N is then given a sudden blow, whereby the rod A will be caused to be moved outwardly from the bushing, and by reason of the key having its curved upper end projecting beyond the surface of the rod, and this projecting end engaging the bushing O, the latter will have the sudden blow or blows imparted to the wedge, transmitted to it, whereby it will be loosened from its jammed-in position. Further blows imparted to the wedge will cause the rod to be moved outwardly and the bushing to be drawn along with it. At the end of the effective movement of the .Wedge N, it is withdrawn, the sleeve 0 rotated so as to bring the nextsmaller sized recess, 0 in line with the wedge. Force is then applied to the wedge and thus the rod A further withdrawn and the bushing thereby further extracted. At the end of its effective stroke the wedge is again withdrawn, the sleeve 0 rotated, and the wedge caused to engage another recess, now the smallest, 0. Force is again applied to the wedge, having the same result as before, at the end of which the bushing is en- .tirely extracted, with no injury to the chuck of the piston.

My improved bushing puller has been described as applicable more particularly to the extraction of bushings from chucks of rock drill pistons. It is clear that such puller may be applied to the extraction of bnsh ings of similar and other devices.

I have described one particular embodiment of my invention and modifications thereof may be made without departing from the spirit-of my invention.

Having thus described my invention, I claim as new and desire to secure by Letters Patent:

1. A bushing puller, comprising a central rod having a recess near one end and a slot near the other, a key for the recess projecting beyond the face of the rod, a sleeve, and a wedge interposed between one end of the slot of the rod and the sleeve.

2. A bushing puller, comprising a central rod provided with a slot near one end and a recess near the other, hav ing an inclined portion at one end thereof, a key having an inclined end adapted to engage the inclined portion of the recess, a sleeve, and a wedge interposed between one end of the slot of the rod and the sleeve.

3. A bushing puller, comprising a central rod having a recess near one end and a slot near the other, a key for the recess projecting beyond the face of the rod, a sleeve having a plurality of recesses at one end of ditlerent sizes, and a wedge adapted to engage some of the recesses of the sleeve, and the slot.

4. A bushing puller, comprising a central rod provided with a recess near one end and a slot near the other, said recess having a plane bottom with an inclined portion in respect thereto at one end thereof, and a curved portion at the other end, a key having a curved portion at one end and an inclined portion at the other adapted to respectively engage the corresponding portions of the recess of the rod, a sleeve, and a wedge interposed between one end of the slot of the rod and the sleeve.

5. A bushing puller comprising a rod having means whereby it may be engaged with the bushing, a sleeve embracing the rod, and a non-rotatable wedge whereby the rod is displaced relatively to the sleeve.

(i. A bushing puller comprising a rod having means whereby it may be engaged with the bushing. said rod being provided at the opposite end with a slot, a sleeve to embrace said rod, and a wedge in said slot whereby the rod is moved relatively to said sleeve.

7. I11 a bushing puller, the combination, with a bushing pulling rod having a slot therein, of a wetge in said slot, and a device rotatable about the rod and having a plurality of wedge-receiving openings.

8. In a bushing puller, the combination. with the rod having a slot, and the '01 go operating in said slot, of a device mounted to turn on the rod and intended to be interposed between the wedge and the .chuck, said device causing the rod to be driven outwardly through ditl'erent distances according to the angular position of said device.

I). In a bushing puller, the combination, with the rod having a slot therein, and the wedge operating in said slot, of a sleeve mounted to turn on said rod between the wedge and the chuck and provided with wedge-receiving openings 01' ditTerent sizes.

10. In a bushing puller, a rod to withdraw the bushing having a recess provided with an inclined endportion. and a key seated in said recess and having an inclined end to engage said inclined portion, said key having a shoulder to engage in the slot in the bushing.

In testimony, that I claim the foregoing as my invention, I have signed my name in presence of two subscribing witnesses.

JOSl llll ZIMMS.

\Vitnesses (4. l. Gomncn,

DAVID LEVINE. 

